Portion of a display screen with an icon



FIG. 1 is a front elevational view of the portion of a display screen with an icon showing our new design;

FIG. 2 is a front elevational view of another embodiment of the portion of a display screen with an icon showing our new design; and,

FIG. 3 is a front elevational view of another embodiment of the portion of a display screen with an icon showing our new design.

The broken lines showing the display screen form no part of the claimed design. 

CLAIM The ornamental design for a portion of a display screen with an icon, as shown and described. 